Question Paper of "DATA COMMUNICATION NETWORKS" for M. Tech (ECE) (Sem.-1st), Subject Code: EC-503, Paper ID [ E-0563 ], PTU Question Paper.

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Roll No……

Total No. of Questions: 08

M. Tech (ECE) (Sem.-1^st)

DATA COMMUNICATION NETWORKS

Subject Code: EC-503

Paper ID: [E-0563]

Time: 3 Hrs.                                                                 Max. Marks: 100

Instruction to Candidates:

1.     Attempt any FIVE questions.

2.     All questions carry EQUAL marks.

Q1.

(a)  What are the different types of transmission impairments for guided media? Explain in detail.

(b) Explain the different techniques used for analog data digital signals encoding formats.

Q2.

(a)  A signal is quantized using 10 bit PCM. Find the signal to quantization noise ratio.

(b) What is difference between error detection and error correction? Explain digital CRC in detail with the help of example.

Q3.

(a)  What is meaning of Error control and its types? Explain in detail.

(b) What is the difference between Synchronous and Asynchronous transmission?

Q4. What is the difference between TDM and STDM in Detail? How error and flow control and accomplished in synchronous time division multiplexing in term of data link control and physical layer?

Q5. List the advantages of UDP over TCP. Describe the steps for establishing and terminating a TCP connection.

Q6. Explain Architecture and working of ATM. Also discuss header error control operation of receiver.

Q7. What are the advantages of IPv6 over Ipv4? Describe three IPv6 special addresses.

Q8. Write a short note on any two:

(a)  Intrusion detection system

(b) FDDI

(c)  Window NT operating system.

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Question Paper of "DATA COMMUNICATION NETWORKS" for M.Tech (PE) (Sem.- 1st), Paper ID [ EC-503], PTU Question Paper.

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Roll No…….

Total No. of Questions: 08

Examination May-2014

M.Tech.

DATA COMMUNICATION NETWORKS

EC-503

Time: 3 Hrs.                                                                 Max. Marks: 100

Note: Attempt any five questions out of eight.

Q1. Explain the Network layer design issues in detail.

(20)

Q2.

(a) What are the reasons for using layered protocols?

(7)

(b) Distinguish between data rate and baud rate. Can you give examples where baud rate is (a) higher, (b) lower than the data rate? Explain.

(13)

Q3. Explain in detail

(a) Domain Name System (DNS)

(b) File Transfer Protocol (FTP)

(20)

Q4.

(a)  Describe how layers in OSI reference model correspond to layers in the TCP/IP model.

(10)

(b) What are the different services provided to transport layer.

(10)

Q5.

(a)  How is VRC related to LRC.

(10)

(b) List the steps involved in creating a checksum.

(10)

Q6. Write short notes on:

(a)  Three Major Multiplexing Techniques

(b) How is CRC superior to LRC

(c)  Error Control in Stop-and-wait Mechanism

(20)

Q7.

(a)  How is one TDM signal separated into its original components? Consider both implementation of TDM.

(10)

(b) How is ATM used in a WAN.

(10)

Q8.

(a)  Explain the technology (switching) which helps in wireless transmission. Also, explain how it will be realised practically.

(10)

(b) Explain how connection is established and released in TCP protocol? What are the different situations that may be encountered?

(10)

                                                   

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Question Paper of "DATA COMMUNICATION NETWORK" for M.Tech (PE) (Sem.- 1st), Subject Code: EC-503, Paper ID [ E0563 ], PTU Question Paper.

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Roll No……..

Total No. of Questions: 08

M. Tech. (ECE) (Sem.-1^st)

DATA COMMUNICATION NETWORK

Subject Code: EC-503

Paper ID: [E0563]

Time: 3 Hrs.                                                                 Max. Marks: 100

Instruction to Candidates:

1.     Attempt any FIVE questions out of EIGHT questions.

2.     Each question carry TWENTY marks.

Q1.        

(a) What is Data Communication? What are the possible ways of Data transmission and explain with examples? Draw a block diagram of Data Communication system and explain its components.

(10)

(b) What are the various characteristics that define the effectiveness of a data communication system? Explain.

(10)

Q2.

(a)  Differentiate between Synchronous and Asynchronous data transmission with the help of suitable examples.

(10)

(b) What are the various strategies for dealing with the errors in a network? Explain each with the help of suitable example.

(10)

Q3.

(a)  The following character encoding is used in a data link protocol:

A:01000111;  B:11100011; FLAG; 01111110; ESC: 11100000

Show the bit sequence transmitted (in binary) for the four-character frame: A B ESC FLAG when each of the following framing methods are used:

(i)                Character count

(ii)             Flag bytes with byte stuffing

(iii)           Starting and ending flag bytes, with bit stuffing

(12)

(b) A bit string, 0111101111101111110, needs to be transmitted at the data link layer.  What is the string actually transmitted after bit stuffing?

(4)

(c)  Data link protocols almost always put the CRC in a trailer rather than in a header. Why?

(4)

Q4.

(a)What do you mean by Multiplexing? What is its use? Explain the different types of Multiplexing along with their advantages and disadvantages.

(10)

(b) Differentiate between datagram and virtual circuit approaches for packet-switching.

(10)

Q5.

(a)  What are the various types of LAN access control methodologies?

(12)

(b) With the help of necessary flow chart explain the working of  CSMA/CD.

(8)

Q6.

(a)  Differentiate between IPv4 and IPv6.

(10)

(b) Compare and Contrast OSI and TCP/IP models.

(10)

Q7.

(a)  What are the differences between message confidentiality and message integrity? Can you have one without the other? Justify your answer?

(5)

(b) What is the difference between an active and a passive intruder?

(4)

(c) What is the difference between a symmetric key system and a public key system?

(5)

(d) What is a key distribution center? What is a certificate authority?

(3)

(e) What is the main-in-the-middle attack? Can this attack occur when a symmetric keys are used?

(3)

Q8.

(a)  Which file system is used in the following operating systems:

(i)                Windows NT.

(ii)             Linux

(iii)           Unix

(3)

(b) What is the size of ATM cell? Explain in detail the ATM header for the user-subnet interface and for the internal subnet.

(7)

(c) Some organizations use firewalls to isolate groups of users internally. Give example of ways that internal firewalls can improve network performance and example of ways internal firewalls can degrade network performance.

(10)

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Question Paper of "DATA COMMUNICATION NETWORKS" for M.Tech (PE) (Sem.- 1st), Subject Code: EC-503, Paper ID [ E0563 ], PTU Question Paper.

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 Roll No……….

Total No. of Questions: 08

M. Tech. (ECE) (Sem.-1^st)

DATA COMMUNICATION NETWORKS

Subject Code: EC-503

Paper ID: [E0563]

Time: 3 Hrs.                                                                 Max. Marks: 100

Instruction to Candidates:

1.     Attempt any FIVE questions out of EIGHT questions.

2.     Each question carry TWENTY marks.

1.     Explain the design issues of data link layer.

(20)

2.     (a) Discuss salient features of OSI reference model.

(7)

(b) Distinguish between data rate and baud rate. Can you give examples where baud rate is (a) higher, (b) lower than the data rate? Explain

(13)

3.     Explain in detail:

(a)  ALOHA

(b) CSMA

(20)

4.     (a) Explain the process for computing the class of Internet protocol address.

(10)

(b) What are the different services provided to transport layer.

(10)

5.     (a) Explain IEEE standards for MAN.

(10)

(b) Explain IEEE standards for LAN.

(10)

6.     Write short notes on:

(a)  Shortest path routing.

(b) Cyclic Redundancy Check.

(c)  Error Control in Stop-and-Wait Mechanism.

(20)

7. (a) How does TDM combine multiple signals into one?

(10)

    (b) Discuss the issues involved when ATM is used in LANs.

(10)

8.     (a) Given a bandwidth of 10,000 Hz (1000 to 11,000 Hz), find the carriers and the bandwidths in each direction.  Assume there is no gap between the bands in two directions. Draw the full-duplex ASK diagram of the system.

(12)

(b) What is the difference between a physical address and a logical address?

(8)

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Question Paper of "DATA COMMUNICATION NETWORK" for M.Tech (PE) (Sem.- 1st), SUBJECT CODE: EC-503, Paper ID [ E0563 ], PTU Question Paper.

ptupaper.com

Roll No………

Total No. of Questions: 08

M. Tech. (Sem.-1^st)

DATA COMMUNICATION NETWORK

SUBJECT CODE: EC-503

PaperID: [E0563]

Time: 03 Hours                                                                      Max. Marks: 100

Instruction to Candidates:

1.     Attempt any FIVE questions.

2.     All questions carry equal marks.

Q1)

(a) What are the different types of transmission media, Explain in Detail.

(b) Explain the different types of digital signal encoding formats for signal 010011100011.

         

Q2)

 (a) What is the difference between Synchronous and Asynchronous transmission?

(b) What is error detection explain CRC in detail with the help of example.

Q3)

(a) What is meaning of flow control and its types. Explain in Detail.

(b) What is Packet switching and its types, explain in detail.

Q4)    What is multiplexing and its types. Explain the difference between TDM and STDM in Detail.

Q5)    What is OSI model briefly describe the TCP/IP and X.25 protocols models.

Q6)    Explain the Architecture and working of ATM. Also discuss the call establishment and transmission of ATM cell.

Q7)    What are the advantages of IPv6 over Ipv4. Explain IPv6 address format and discuss how any cast and multicast addresses are used in IPv6.

Q8)    Write a short note on any two:

a)     FDDI.

b)    DQDB.

c)     Firewalls.

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